%0 Generic %1 sarkar2016diffuse %A Sarkar, Kartick C. %A Nath, Biman B. %A Sharma, Prateek %A Shchekinov, Yuri %D 2016 %K cgm emission luminosity x-ray %T Diffuse X-ray emission from star forming galaxies %U http://arxiv.org/abs/1601.00394 %X We study the diffuse X-ray luminosity ($L_X$) of star forming galaxies using 2-D axisymmetric hydrodynamical simulations and analytical considerations of supernovae (SNe) driven galactic outflows. We find that the mass loading of the outflows, a crucial parameter for determining the X-ray luminosity, is constrained by the availability of gas in the central star forming region, and a competition between cooling and expansion. We show that the allowed range of the mass loading factor can explain the observed scaling of $L_X$ with star formation rate (SFR) as $L_X \propto$ SFR$^2$ for SFR $1$ M$_ødot$yr$^-1$, and a flatter relation at low SFRs. We also show that the emission from the hot circumgalactic medium (CGM) in the halo of massive galaxies can explain the sub-linear behaviour of the $L_X-$SFR relation as well as a large scatter in the diffuse X-ray emission for low SFRs ($łesssim$ few M$_ødot$yr$^-1$). Our results point out that galaxies with small SFRs and large diffuse X-ray luminosities are excellent candidates for detection of the elusive CGM.

@misc{sarkar2016diffuse, abstract = {We study the diffuse X-ray luminosity ($L_X$) of star forming galaxies using 2-D axisymmetric hydrodynamical simulations and analytical considerations of supernovae (SNe) driven galactic outflows. We find that the mass loading of the outflows, a crucial parameter for determining the X-ray luminosity, is constrained by the availability of gas in the central star forming region, and a competition between cooling and expansion. We show that the allowed range of the mass loading factor can explain the observed scaling of $L_X$ with star formation rate (SFR) as $L_X \propto$ SFR$^2$ for SFR $\gtrsim 1$ M$_\odot$yr$^{-1}$, and a flatter relation at low SFRs. We also show that the emission from the hot circumgalactic medium (CGM) in the halo of massive galaxies can explain the sub-linear behaviour of the $L_X-$SFR relation as well as a large scatter in the diffuse X-ray emission for low SFRs ($\lesssim$ few M$_\odot$yr$^{-1}$). Our results point out that galaxies with small SFRs and large diffuse X-ray luminosities are excellent candidates for detection of the elusive CGM.}, added-at = {2016-01-05T10:37:12.000+0100}, author = {Sarkar, Kartick C. and Nath, Biman B. and Sharma, Prateek and Shchekinov, Yuri}, biburl = {https://www.bibsonomy.org/bibtex/204f420e1f3a596fb441d978a47497002/miki}, description = {[1601.00394] Diffuse X-ray emission from star forming galaxies}, interhash = {0938bcda5bfbc856427f8f42f6435610}, intrahash = {04f420e1f3a596fb441d978a47497002}, keywords = {cgm emission luminosity x-ray}, note = {cite arxiv:1601.00394Comment: 4 figures, Submitted to ApJL, Comments are welcome}, timestamp = {2016-01-05T10:37:12.000+0100}, title = {Diffuse X-ray emission from star forming galaxies}, url = {http://arxiv.org/abs/1601.00394}, year = 2016 }